Back-spacing mechanism for type-writers.



H. RAYMOND. BACK SPACING IVIEGHANISM FOR TYPE WRITERS.

APPLIOATIOI? FILED DEG. 18, 1909.

Patented May 10, 1910.

WITN/ESSES 6) CUT)? K i :g 3' I HWZZHI space.

HARRY RAYMOND, OF SYRACUSE, NEW YORK, ASSIGNOR SYRACUSE, NEW YORK.

TO E. 0. sessions or BAOK-SPACING MEGHANISI-KI FOR TYPE-WRITERS.

Patented Ellery to, iwfit Specification of Letters Patent. Application filed December 18, 1908. Serial No. 533,958.

se m.

T 0 all whom it may concern? pletely withdrawn from Be it known that l. liARRY RAYMOND, a which it engages. citizen of the United States, residing at I When thelzeyitis depressed the parts first. Syracuse. in the county of Onondaga, in the i assume the dotted positions. The dog C State of New York. have invented new and l sliding along an oblique portion of dog D useful Improvements in Back Spacing swings D between the'teeth of the gear and Mechanisms for 'lh'pe-ilritt rs.of which the f positively prevents its withdrawal before the t t the teeth with following is a elear and accurate speeiticalever A is raised. Further depression of tion, with reference to the the lever it causes the arm E with all its atdrawing. taehed parts to swing upwardly until it;

The invention consists of means for shite strikes the stop (It. The pawl P will now ing the carriage of a typewriter one letter engage with a tooth removed from, the space in the direction contrary to that em tooth it formerly engaged by a distance repplo ved in writing and positively preventing resenting one letter space in the movement its being carried by inertia more than one of the carriage and prevent; the return of the carriage when the dog D ceases to hold it. Upon the raising of the lever A the acturompanying The drawing shows ip full lines the mechanisnrat rest. The dotted lines show the relative position of the members after the operating hey has been partially depressed. f The positive lock is clearly illustrated in the dotted position.

The haelc spacer is shown attached to the driving ,Qttll' on a gear driven carriage machine. It might with equal facility, how ever, be applied directly to the carriage or other moving part.

Letter l, represents the carriage 1:01;.

I is the carriage driving gear containing the carriage driving spring J tending to move the parts in the direction indicated by the solid arrows.

The parts M, N and P constitute a mech anism for normally preventing the spring from moving the carriage but leaving the carriage free to he moved against the pressure of the spring by external means.

The arm E freely pivoted concentric with the gear I. 'l'lie engaging dog D and the actuatin and locking dog C are mounted on arm i) so that they freely swing on their respective centers.

is an actuating lever pivoted at some point; t) to the frame of the typewriter.

' is a connecting rod transmitting motion of A to C. a

F is a bracket adjustably mounted on the frame having an upper stop G which limits the upward swin of the arm E. H is a lower stop on the same bracket against which the lower portion of the engaging dog I) strikes limiting the downward motion ot the arm i The (log I) and the stop it are so shaped relatively that when l} comes down against H the upper end of I) is comtion and strike against the step t The pull ot the. connecting rod then transferred to the arm E. The lower portion the tooth on dog 1) is made oblique so that when it. is drawn downward it is partially swung out of the gear. When it. strikes the stop 1:1 it is completely withdraw It is apparent since the dog is posh tively held in mesh with the gear, that the movement of the gear is positively limited to the movement of the dog D and arm I), which are in turn positively limited by the stopsG and H.

Having described my invention I claim as new:

1. In a typewriter, a carriage, gearing connected to the carriage, means for causing the carriage to tend to move in one three. tion, means for normally p eventing its movement in that direction, an actuating key, a dog D adapted to swing between two consecutive teeth of said gearing, a. movable arm supporting said do a second dog" 0 pivoted to said arm anr adapted to cause the dog 1) to engage said gearing and positively prevent said clog D from sl.='.pping.;- on the teeth of sai" gear, means for connecting the actuating key and the deg C, and stone; for limiting the movement ot said mova'oo arm.

2. In a typewriter, a carriage, gearing connected to the carriage, means for causing the carriage to tend to move in one direction, means for normally preventing its the its movement in the opposite direction, means for causing said carriage to move a movement in that direction but permitting ating dog" (1' will at once take its initial posidefinite distance in said opposite direction consistin of: a vibrating member; means for positively attaching said vibrating memher to said gearing during the movement of said vibrating member in one direction consisting of a movable dog D adapted to enter between two consecutive teeth of said gearing, a dog C for pushing dog D into engagement with said teeth and positively holding it there; means for actuating said vibrating member; means for limiting the motion of said vibrating member.

3. In a device for back spacing a typewriter carriage, gear teeth for driving the carriage, a member having a limited oscillating movement past said gear teeth, a dog pivoted to said oscillating member and adapted to enter between said gear teeth, an actuating and locking dog also pivoted to said oscillating member and adapted to force said dog between said gear teeth and prevent its Withdrawal until said dog is itself released, meansfor limiting the motion of said oscillating member, means for limiting the rotation of said locking dog, and means for actuating said locking dog and said oscillating member.

In testimony whereof I aflix my signature in the presence of two witnesses.

HARRY RAYMOND.

\Vitnesses \VALTER A. PAPwoR'rH, L. B. NICHOLSON. 

